Method for operating blast furnace

摘要

Provided is a method for operating a blast furnace with which it is possible to further increase the combustion temperature and reduce the amount of reducing material required per basic unit. A lance (4) for blowing in reducing materials from a tuyere (3) is provided with a double-tube structure. A solid reducing material such as pulverized coal (6) and a flammable reducing material such as city gas (9) are blown in from the double-tube lance (4), and the oxygen excess ratio of the blast of air blown to the tuyere (3) is set between 0.7 and 1.3. In this way, the city gas (9) that comes into contact with the O